In a Choco deck youll often be attacking with numerous small birds, and if some of them die to blockers or removal Soulcatchers' Aerie will massively buff the survivors
This mechanic is highly reminiscent of for Mirrodin!, which had the token + auto-equip functionality (those tokens were 2/2 red Rebels though)
Use the number of Towns you control when PuPu UFO's last ability resolves to determine PuPu UFO's new base power
Having your buffs be card-neutral keeps your hand full and your interaction at the ready, and you wont stall out if your big tough creature gets zapped
This means none of your enchantments can be targeted, you can't be targeted or dealt damage, and though you can't draw from your draw step you still will cycle through your deck with your enchantress effects
Foiling your commander is a rite of passage, and the guaranteed foil count means you're not gambling on a single foil slot like you would in Play Boosters